Video control circuit for a video display device
US6288690A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/68
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video control circuit controls the gains for red(R), green(G), and blue(B) color video signals inputted to a monitor, the brightness and contrast of a video display on the monitor, and the bias of a cathode ray tube within the monitor. A microcomputer outputs, in an I.sup.2 C manner, data for a control signal for controlling contrast, brightness, gain and/or bias. The data are inputted to an I.sup.2 C data process/PWM signal generation section which converts the data to PWM signal outputs. Rectification sections rectify the PWM signal outputs to provide contrast, brightness, gain and cutoff voltage signals. Only two output terminals of the microcomputer are employed for outputting a clock signal and the data for the control signal so as to control contrast, brightness, gain and bias control signals according to output signals of the variable resistors VR11 and VR12 and a bias/grain control section. A clock signal is generated by the microcomputer in synchronization with the data DATA. The I.sup.2 C data process/PWM signal generation section generates the PWM signal outputs for contrast, brightness, bias and gain control according to the data received from the microcomputer. Recti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.